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was是be动词的过去式。was后面动词可以是现在分词，构成过去进行时态；可以是过去分词，构成被动语态；was作系动词时，后边接现在分词、动名词短语作表语，还可以接过去分词作表语。
be动词例句
The man is a science teacher.
这个男子是一位科学教师。
Mary's new dresses are colourful.
玛丽的新衣服色彩鲜艳。
I have been there before.
我以前去过那里。
My mother is in the kitchen now.
我妈妈现在在厨房里。
这四个都是陈述句，可以变成疑问句，方法简单，把主语和“be”或助动词对换位置即可：
Is the man a science teacher?
Are Mary's new dresses colourful?
Have I been there before?
Is mother in the kitchen now?